cpp: Add some convenience functions

* lang/cpp/src/context.cpp (Context::create): New.
* lang/cpp/src/context.h: Update accordingly.
* lang/cpp/src/key.cpp, lang/cpp/src/key.h:
(Key::isBad, Subkey::isBad, UserID::isBad)
(UserID::Signature::isBad): Add shorthand for the isX checks.
* NEWS: Mention it.

--
I don't know how often I wrote:
if (key.isNull() || key.isExpired() || key.isRevoked() ...

And for the context it is good practice to use a unique ptr
so the API should make it easy.

1 files changed, 14 insertions, 0 deletions

diff --git a/lang/cpp/src/key.h b/lang/cpp/src/key.h
index 76a0d4f4..c4edba07 100644
--- a/lang/cpp/src/key.h
+++ b/lang/cpp/src/key.h
@@ -98,6 +98,10 @@ public:
     bool isDisabled() const;
     bool isInvalid() const;
 
+    /*! Shorthand for isNull || isRevoked || isExpired ||
+     *                          isDisabled || isInvalid */
+    bool isBad() const;
+
     bool canEncrypt() const;
     /*!
       This function contains a workaround for old gpgme's: all secret
@@ -250,6 +254,10 @@ public:
     bool isInvalid() const;
     bool isDisabled() const;
 
+    /*! Shorthand for isNull || isRevoked || isExpired ||
+     *                          isDisabled || isInvalid */
+    bool isBad() const;
+
     bool canEncrypt() const;
     bool canSign() const;
     bool canCertify() const;
@@ -366,6 +374,9 @@ public:
     bool isRevoked() const;
     bool isInvalid() const;
 
+    /*! Shorthand for isNull || isRevoked || isInvalid */
+    bool isBad() const;
+
     /** TOFU info for this userid.
      * @returns The TOFU stats or a null TofuInfo.
      */
@@ -454,6 +465,9 @@ public:
     bool isExpired() const;
     bool isExportable() const;
 
+    /*! Shorthand for isNull || isExpired || isInvalid */
+    bool isBad() const;
+
     const char *signerUserID() const;
     const char *signerName() const;
     const char *signerEmail() const;